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Finding the Fourth Proportional to 127.85, 191.88 and 55.70

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Solution

The fourth proportional to 127.85, 191.88 and 55.70 is: 83.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.85 : 191.88 = 55.70 : x
  2. Step 2: Convert to fraction form
    127.85/191.88 = 55.70/x
  3. Step 3: Cross multiply
    127.85x = 191.88 × 55.70
  4. Step 4: Simplify right side
    127.85x = 10,686.76
  5. Step 5: Solve for x
    x = 10,686.76/127.85
  6. Step 6: Final answer
    x = 83.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.